Samsung sgh-m200 has no network - Cell Phones

No Network error only appear if your phone is not getting the service provider's signal. You need to check the status of your account from your mobile service provider by calling them. You can also check if the sim is properly inserted. You can also check the capability of using compatible sim card to your phone to isolate faulty sim card issues. Try to insert the sim card to another compatible phone as well. if sim card to another compatible phone works then there is a problem from your phone's end by getting a signal.